Summary
The mass spectra of recoil nucleon states from the inelastic production of ρ0 mesons by incident pions of 12 and 18 GeV/c have been studied in a spark chamber experiment. From over 2000 events, qualitative agreement with a one-pion-exchange calculation is found, both in the magnitudes of the cross-sections and in the missing mass spectra of the nucleon states. The dominance of this channel over elastic ρ0 production and the consequences of extending the model to very high energies are discussed.
Riassunto
In un esperimento in camera a scintilla si sono studiati gli spettri di massa degli stati del nucleone di rinculo della produzione anelastica di mesoni ρ0 con pioni incidenti di 12 e 18 GeV/c. Su più di 2000 eventi si trova un accordo qualitativo con il calcolo di scambio di un pione, sia per la grandezza delle sezioni d'urto che per gli spettri dei difetti di massa degli stati nucleonici. Si discutono la predominanza di questo canale sulla produzione elastica di ρ0 e le conseguenze dell'estensione del modello alle altissime energie.
Similar content being viewed by others
References
J. D. Jackson andJ. T. Donohue andK. Gottfried andR. Keyser andB. E. Y. Svensson:Phys. Rev.,139, B 428 (1965);J. D. Jackson:Rev. Mod. Phys.,37, 484 (1965).
S. D. Drell:Phys. Rev. Lett.,5, 342 (1960).
A. S. Goldhaber:Phys. Rev.,134, B 600 (1964).
E. Bleuler, D. O. Caldwell, B. Elsner, D. Harting, L. W. Jones, W. C. Middelkoop, B. Zacharov, M. J. Perl andC. C. Ting:Nucl. Instr. and Meth.,20, 208 (1963);L. W. Jones, D. Harting, W. Middelkoop, B. Zacharov, D. O. Caldwell, E. Bleuler andB. Elsner: Univ. of Michigan Technical Report No. 17 (unpublished), andInternational Conference on High-Energy Physics, Dubna (1964) (to be published);D. Harting, P. Blackall, B. Elsner, A. C. Helmholz, W. C. Middelkoop, B. Powell, B. Zacharov, P. Zanella, P. Dalpiaz, M. N. Focacci, S. Focardi, G. Giacomelli, L. Monari, J. H. Benney, R. A. Donald, P. Mason, L. W. Jones andD. O. Caldwell:Nuovo Cimento,38, 60 (1965) (for an elaboration of the technique).
F. Selleri:Phys. Lett.,3, 76 (1962).
We would like to thankR. Deck, S. Drell andB. E. Y. Svensson for clarifying the application of this expression to our problem.
J. D. Jackson:Nuovo Cimento,34, 1644 (1964).
L. W. Jones:Phys. Rev. Lett.,14, 186 (1965).
B. Zacharov:Nucl. Instr. and Meth.,32, 163 (1965);33, 136 (1965).
G. Fast andR. Hagedorn:Nuovo Cimento,27, 208 (1963);G. Fast, R. Hagedorn andL. W. Jones:Nuovo Cimento,27, 856 (1963);L. W. Jones:Phys. Lett.,8, 287 (1964);A. Białas andV. F. Weisskopf:Nuovo Cimento,35, 1211 (1965).
G. Cocconi, E. Lillethum, J. P. Scanlon, C. A. Stahlbrandt, C. C. Ting, J. Walters andA. M. Wetherell:Proc. Sienna Conference on High-Energy Physics (1963);G. Bellettini, G. Cocconi, A. M. Diddens, E. Lillethun, J. P. Scanlon, A. M. Shapiro andA. M. Wetherell:Phys. Lett. 18, 167 (1965);G. Bellettini, G. Cocconi, A. D. Diddens, E. Lillethun, J. P. Scanlon andA. M. Wetherell:Proc. International Symposium on Electron and Photon Interactions at High Energies, Hamburg, 1965 (to be published);E. Ferrari, S. Gennarinia andP. Lariccia:Nuovo Cimento,39, 169 (1965).
C. C. Peck, L. W. Jones andM. L. Perl:Phys. Rev.,126, 1836 (1962);B. Maglić andG. Costa:Phys. Lett.,18, 185 (1965).
R. Deck:Phys. Rev. Lett.,13, 169 (1964).
B. Shen, J. L. Brown, G. Goldhaber, S. Goldhaber andG. H. Trilling: preprint (to be published in theProc. of the Oxford International Conference on Elementary Particles, 19–25 Sept. 1965).
Author information
Authors and Affiliations
Additional information
Supported in part by the Ford Foundation and the U.S. Office of Naval Research, contract no. 1224-23.
Supported in part by the U. S. Atomic Energy Commission.
Traduzione a cura della Redazione.
Rights and permissions
About this article
Cite this article
Jones, L.W., Bleuler, E., Caldwell, D.O. et al. The mass spectra of recoil nucleon states from inelastic ρ0 production by pions of 12 and 18 GeV/c. Nuovo Cimento A (1965-1970) 44, 915–926 (1966). https://doi.org/10.1007/BF02719339
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF02719339